/* =============================================================
 * Your Grandmother's guide to Algorithms
 * =============================================================
 *
 * Copyright (c) 2007, Saverio Miroddi
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions are met:
 * 
 *     * Redistributions of source code must retain the above copyright notice,
 *       this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright 
 *       notice, this list of conditions and the following disclaimer in the 
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of the SaverioMiroddiSoftware nor the names of its 
 *       contributors may be used to endorse or promote products derived from 
 *       this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER 
 * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *  
 * ---------------------------
 * AbsTreeComponent.java
 * ---------------------------
 *
 */
package treegui.graphlibwrappers;

import java.awt.Dimension;
import java.util.List;

import javax.swing.JComponent;

import treegui.nodewrappers.IGuiNode;
import treegui.nodewrappers.IGuiNode.EdgeCoordinate;

public abstract class AbsTreeComponent {
	protected List<IGuiNode> treeData;
	protected final Dimension screenOfs;
	
	protected AbsTreeComponent(List<IGuiNode> treeData, Dimension screenOfs)
	{
		checkData(treeData);
		
		this.treeData = treeData;
		this.screenOfs = screenOfs;
	}
	
	private void checkData(List<IGuiNode> treeData) {
		for (IGuiNode node : treeData)
			if (node == null) throw new NullPointerException("null node found in list");
	}

	public JComponent getGraphComponent() {
		init();
		setupTree();
		
		return getResultingGraphComponent();
	}
	
	/** slowbutwhocares */
	private void setupTree() {
		for (int i = 0; i < treeData.size(); i++) {
			setBox(i);
		}
		
		for (IGuiNode node : treeData) {
			for (EdgeCoordinate edge : node.getEdgeCoordinates()) {
				int fromIdx = treeData.indexOf(edge.from);
				int toIdx = treeData.indexOf(edge.to);
				
				if (fromIdx == -1) {
					System.err.println("Edge FROM not found: " + edge.from);
				}
				else if (toIdx == -1) {
					System.err.println("Edge TO not found: " + edge.to);
				}
				
				try {
					setArrow(fromIdx, toIdx);
				}
				catch (RuntimeException e) {
					e.printStackTrace();
				}
			}
		}
	}
	
	protected abstract void init(); 
	
	protected abstract void setBox(int childPos);
	
	/** This must be called after having set the boxes */
	protected abstract void setArrow(int fromPos, int toPos);
	
	protected abstract JComponent getResultingGraphComponent();
}
